Guide device for boring tools



J. M. CROCKER AND W. C. MAGUNE.

' GUIDE DEVICE FOR BORING TOOLS.

APPLICATION FILED MAR. 29. 1921.

1 ,408,8Q2. Patented Mar- 7, 1922.

/0 J 3 6 a 7 /6 4 6 Q W /IN I INVENTORS JAMES M CROCKEI? ATTORNEY JAMIESLVI. CROCKER AND WILBUR C. MAGUNE, OF

FAIRFIELD, CONNECTICUT.

ASSIGNORS OF ONE-THIRD TO MDRRIS REICH, OF BRIDG-EPORT, CONNECTICUT.

GUIDE DEVICE FOR BGPt-ING TOOLS.

Application filed March 29, 1921.

7 '0 (all 2,0 /1 am it may can earn Be it known that we, JAMES M.CRooKEn and WILBUR C. MAGUNE, citizens of the United States, andresidents of Fairfield, in the county of F airfield and State of Connecticut, have invented certain new and useful Improvements in GuideDevices for Boring Tools, of which the following is a specification.

This invention relates to a device designed more especially for guidinga boring tool when said. tool is to do its work at a distance from theoperator, as for example, when aligning holes are to be made through aseries of spaced apart members such as joists.

An object of the invention is to provide a simple and inexpensive deviceof the present character which can be quickly and easily applied to orremoved from a tool, and which will in use etliciently perform itsintended function.

A further and more specific object is to provide a guide device whichwill accommodate itself to holes bored in members by a tool when in,operation to follow the tool through said members, will when releasedfrom a member spread out'to guide the tool to the next member, and willaccommodate itself to said holes when the tool. is withdrawn from themembers.

lVith the above and other objects in view, the invention comprises theconstruction, arrangement and combination of parts as now to be fullydescribed and hereinafter specifically claimed, it being understood thatsuch changes in details of construction and arrangement of parts may bemade as fall within the spirit of theinvention and with in the scope ofthe appended claims.

In the accompanying drawing forming a part of this specification, V

Fig. 1 is a sectional view of a ceiling and joists, showing a boringtool equipped with the novel device and the device spread as whenguiding the tool;

Fig. 2 is a view corresponding with Fig.

1, but showing the guide device as when being withdrawn from the joists,the spreadable part of the device being disclosed in the act ofaccommodating itself to a hole in a joist;

Fig. 3 is an enlarged elevational view of Specification of LettersPatent.

Patented Mar. '7, 1922. Serial No. 456,777.

the device, bit shank;

Fig. 4 is an end view looking from the right hand side ofFig. 3 and Fig.5 is an enlarged sectional view on line 5-5 in Fig. 3, looking in thedirection of the arrows.

Referring to the drawing, A represents a ceiling or the like, B a seriesof spaced apart oists extending upwardly therefrom, C a shaft,preferably flexible, adapted to carry a bit or other boring tool D forboring aligning holes E through joists B, and F designates a bit shankof suitable length for its purpose and secured to the shaft bv means ofthe chuck G in usual manner. e have preferred to show our devicearranged upon the bit shank F. It will be clear, however, as thedescription proceeds, that the device can be applied to the boring toolin any other suitable and convenient manner.

Numeral 10 denotes a tubular member mounted upon the bit shank andwithin showing the same applied upon a which said shank can rotate, theopposite ends of said tubular member preferably terminating closelyadjacent the shaft and bit, respectively, and having-fixed thereoncollars, denoted by 11 and 12, respectively, either or both of which maybe removable. As shown, the collar 12 is removably secured by the screw13. Positioned between the col lars and slidably arranged upon thetubular member are a pair of sleeves, denoted by 14 and 15,respectively, numeral 16 denoting a key extendinglongitudinally of thetubular member for the greater part of its length and entering key waysin the sleeves to preclude-the possibility of their rotation on thetubular member, as will be understood.

The slidable sleeves are connected with each other by means of togglejoints each consisting of a pair of links, denoted by numerals 17 and18, pivoted to each other as indicated at 19, said links being pivotedupon sleeves 14 and 15 respectively, in any preferred manner, as bymeans of pins 20. Any number of toggle joints may be employed. As shown,we preferably utilize four and position the same uniformly about thetubular member.

Numerals 21 and 22 denote coil springs arranged upon the tubular memberand between the collars and slidable sleeves, re spectively, spring 21having its opposite ends seated against the collar 11 and sleeve 14:,

a diameter of the bit.

and spring 22 having its opposite ends seated against collar 12 andsleeve 15, and the coil springs are normally expanded to hold thesleeves toward each other to thus hold. the toggle joints spread as inFigs. 1 and 3, as will be understood. It preferred, each collar andslidable sleeve may be constructed to provide guide members, denoted bynumeral 23, for the opposite ends oi the springs, and stops may beutilized to limit the movement of he slidable sleeves toward. eachother. As shown, we preferably provide in the key in the tubular memberspaced apart, threaded holes 2% adapted to removably receive stop pins25, one stop. pin for each sleeve. Obviously, each stop pin can beplaced in any preferred hole to allow theslidable sleeves to be normallyspaced any preferred distance apart and the toggle joints to be normallypositioned at any desired angle. 7

The manner in which the device operates to perform its function will beevident from the description given. As shown more clearly in Fig. 1, theceiling or the like provides a way over which the toggle. joints slidewhen the device is in use. lhe stop pins are first set in the properholes to give the toggle joints the desired spread toguide the tool tobore a hole at the preferred distance from the ceiling or the like.After the. bit has bored a hole through a. oist or other member, forwardpressure against the shaft will cause the guide'device to follow the bitthrough the hole, it being understood that the collarsandslidablesleeves of the guide device are of slightly less diameter than thediameter of the hit. As the links 17 move forwardly they will be engagedclosely adjacent their pivotal points 20 by the for ward end of the wallof the hole made by the bit to be swung toward each other-in the mannersuggested in Fig. 2, and will, naturally, causethe links 18 to bedrawn-toward each other, the coil springs 21 and 22 contracting to anextent to allow the toggle joints to be at a straight angle andenclosed. within a diameter not greater than the Obviously, the wall ofthe hole in the joist will so hold the toggle joints until links 1.8have been coinpletely released by said wall. As soon as said links 18are released, the togglejoints will spread to their normal positions, asin Fig. 1, to guide the tool straight ahead to bore the next hole. Itwill be apparent that when the toolis withdrawn the toggle joints willac- 'commodate themselves to the holes against the action of the coilsprings in preclsely the manner already described, with the exceptionthat the links 18 will be first to enter the holes, asshown more clearlyin Fig. 2.

Having thus fully described the invention, what we claimand desire tosecure by Letters Patent is:

1. A guide device of the character described, comprising a supportingmember, springs thereon and spaced from each other, slidable sleevesupon said supporting member and between said springs, and toggle jointsconnecting said sleeves.

2. A guide device of the character de; scribed, comprising a supportingmember, coil springs thereon and spaced from each other, slidablesleeves upon said supporting member and engaged by said coil springs,toggle joints connecting said sleeves, and means for locating saidsprings upon said supporting member, whereby. said coil springs arenormally extended to hold said toggle joints spread and said togglejoints can be forced toward said supporting member to compress saidsprings.

3. A guide device of the character described, comprising a supportingmember, spaced apart collars thereon, slidable sleeves upon saidsupporting member andbetween said collars, toggle joints connecting saidsleeves, and coil springs upon said supporti ing member and between saidcollars and sleeves, respectively, said coil springs being normallyexpanded to spread said toggle joints.

-l. A guide device of the character described, comprising a supportingmember,

spaced apart collars thereomslidable sleeves upon saidosupporting memberand bet-ween .ard collars, toggle oints connecting said sleeves, coilsprings upon said supporting member and between said collars andsleeves,

respectively, said coilsprings being normally expanded to spread saidtoggle joints, and

adjustable means for limiting the movement of the slidable sleevestoward each other.

5. In combination with a boring tool having a bit shank, a tubularmember in which said bit shank is rotatably mounted, spaced l l (J apartcollars upon, said, tubular member,

slidable sleeves upon said tubular member and between said collars,toggle joints connecting said sleeves, and coil springs on said.

tubular member and between said collars and sleeves, respectively, saidcoil springs being normally- .expanded to. spread said toggle joints,whereb said togglejoints can be positioned at a straight angle againstthe action of said coil springs.

G. A device as specified in claims, wherein the tubular member isprovided with a key adapted to enter key ways in the slidable. sleevesto hold said sleeves against rotation upon said tubular member.

Signed at Bridgeport, in the county of Fairficld, and StateofConnecticut this.

19th day of March, A. D., 1921; JAJVIES M. CROCKER. WILBUR (l. MAGUNE.

